Marathon features action-heavy, first-person shooter gameplay similar to Doom and other contemporaries, and the game is renowned for having an intricate story line that is also an essential element of its gameplay, whereas most similar games devote minimal attention to plot for the sake of faster, simpler, more action-oriented gameplay

To run Marathon on high graphics settings your PC will require at least a 0MB GeForce FX 5200 / Radeon Xpress 1200 Series with a Celeron 1GHz or Duron 2.0GHz CPU. To summarise, Marathon needs around a 16 year old PC to play at recommended settings.